unable to have a result while calling a rest API with Swift - swift

Question

I try to make a small command line program in swift 5 to call a Rest Web service
func callRest() {
URLCache.shared = URLCache(memoryCapacity: 0, diskCapacity: 0, diskPath: nil)
let todoEndpoint: String = "http://myURL"
print (todoEndpoint)
guard let url = URL(string: todoEndpoint) else {
print("Error: cannot create URL")
exit(1)
}
// private let apiKey = "my API Key"
let config = URLSessionConfiguration.default
config.httpAdditionalHeaders = [
"Accept": "application/json",
"API-Key": "my API Key"
]
var session = URLSession.shared
session = URLSession(configuration: config)
let urlRequest = URLRequest(url: url)
let task = session.dataTask(with: urlRequest) { (data, response, error) in
print ("task")
// check for any errors
guard error == nil else {
print("error calling GET on /todos/1")
print(error!)
return
}
// make sure we got data
guard let responseData = data else {
print("Error: did not receive data")
return
}
// check the status code
guard let httpResponse = response as? HTTPURLResponse else {
print("Error: It's not a HTTP URL response")
return
}
print (httpResponse)
}
task.resume()
// Response status
}
print ("debut")
callRest()
print("fin")
And I never see a result...
the line print ("task") is never display
Any help appreciate.
I think I don't really understand the task.resume usage...
(same code work in a playground)